:root{--bg:#f7f8fb;--card:#fff;--text:#111827;--muted:#6b7280;--border:#e5e7eb;--primary:#2563eb;--primaryHover:#1d4ed8;--accent:#f59e0b;--success:#16a34a;--danger:#dc2626;--radius:14px}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Noto Sans JP,sans-serif;line-height:1.5}a{color:inherit;text-decoration:none}main{max-width:860px;margin:0 auto;padding:24px 16px 40px}h1,h2,h3{margin:0 0 16px}p{margin:0 0 12px}ul{margin:0;padding:0;list-style:none}hr{border:none;border-top:1px solid var(--border);margin:16px 0}.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:0 6px 18px #0000000f}.stack{flex-direction:column;gap:12px;display:flex}.row{flex-wrap:wrap;align-items:center;gap:12px;display:flex}.spacer{flex:1}.badge{border:1px solid var(--border);color:var(--muted);background:#fff;border-radius:999px;padding:6px 10px;font-size:12px;font-weight:800;display:inline-flex}.btn{appearance:none;border:1px solid var(--border);width:100%;color:var(--text);cursor:pointer;letter-spacing:.2px;opacity:1;background:#fff;border-radius:14px;padding:14px;font-size:15px;font-weight:900;transition:transform 30ms,background .15s,border-color .15s}.btn:hover{background:#f3f4f6}.btn:active{transform:translateY(1px)}.btn:disabled{opacity:.65;cursor:not-allowed}.btnPrimary{background:#2563eb1f;border:1px solid #2563eb59}.btnPrimary:hover{background:#2563eb2e}.btnAccent{background:#f59e0b24;border:1px solid #f59e0b59}.btnAccent:hover{background:#f59e0b2e}.btnSuccess{background:#16a34a1f;border:1px solid #16a34a4d}.btnSuccess:hover{background:#16a34a29}.choice{text-align:left;background:#fff}.choice:hover{background:#f3f4f6}.choiceCorrect{background:#16a34a38;border:1px solid #16a34aa6;box-shadow:0 0 0 3px #16a34a2e}.choiceWrong{background:#dc262638;border:1px solid #dc2626a6;box-shadow:0 0 0 3px 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#f59e0b73;border-radius:999px;align-items:center;gap:6px;padding:6px 10px;font-size:12.5px;font-weight:900;display:inline-flex}.streakPop{animation:.22s ease-out streakPop}@keyframes streakPop{0%{transform:scale(.92)}60%{transform:scale(1.08)}to{transform:scale(1)}}.btnGhost{border:1px solid var(--border);color:#111;background:0 0}.btnGhost:hover{background:#f3f4f6}.btnDanger{color:#fff;background:#dc2626}.btnDanger:hover{background:#b91c1c}html,body{height:100%}body{overscroll-behavior:none;-webkit-tap-highlight-color:transparent}.safe-bottom{padding-bottom:calc(12px + env(safe-area-inset-bottom))}.detailActionGrid{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-top:12px;display:grid}@media (min-width:640px){.detailActionGrid{grid-template-columns:repeat(4,minmax(0,1fr))}}.gameHero{background:linear-gradient(#ede9fecc,#fff);border:1px solid #7c3aed38;border-radius:16px;padding:12px}.gameHeroTag{color:#5b21b6;margin-bottom:8px;font-size:12px;font-weight:900}.gameHeroBtn{cursor:pointer;color:#fff;background:linear-gradient(135deg,#7c3aed,#5b21b6);border:none;border-radius:14px;width:100%;padding:16px 14px;font-size:18px;font-weight:900;box-shadow:0 10px 18px #5b21b638}.gameHeroBtn:active{transform:translateY(1px)}.gameHeroNote{opacity:.75;margin-top:8px;font-size:12px}.gameHeroMiniRow{margin-top:10px}.appHeader{justify-content:space-between;align-items:center;gap:10px;margin-top:6px;display:flex}.appHeaderLeft{align-items:center;gap:10px;min-width:0;display:flex}.appHeaderBrand{color:inherit;align-items:center;gap:8px;font-weight:900;text-decoration:none;display:flex}.appHeaderLogo{border:1px solid var(--border);background:#fff;border-radius:10px;justify-content:center;align-items:center;width:28px;height:28px;display:inline-flex}.appHeaderName{white-space:nowrap;text-overflow:ellipsis;overflow:hidden}.appHeaderTitle{opacity:.7;white-space:nowrap;text-overflow:ellipsis;font-size:12px;overflow:hidden}.mypageTopbar{justify-content:space-between;align-items:center;margin-top:12px;display:flex}.hamburgerBtn{border:1px solid var(--border);cursor:pointer;background:#fff;border-radius:12px;padding:10px 12px;font-size:18px;font-weight:900;line-height:1}.drawerOverlay{z-index:50;background:#00000059;justify-content:flex-end;display:flex;position:fixed;inset:0}.drawerPanel{background:#fff;flex-direction:column;width:min(320px,86vw);height:100%;padding:14px;display:flex;box-shadow:-12px 0 32px #0000002e}.drawerHead{justify-content:space-between;align-items:center;padding:6px 4px 12px;display:flex}.drawerClose{border:1px solid var(--border);cursor:pointer;background:#fff;border-radius:10px;padding:8px 10px;font-weight:900;line-height:1}.drawerBody{flex-direction:column;gap:10px;display:flex}.drawerBody .btn{width:100%}.drawerLink{border:1px solid var(--border);color:inherit;background:#fff;border-radius:12px;padding:12px;font-weight:800;text-decoration:none;display:block}.drawerLink:hover{filter:brightness(.98)}.drawerDivider{background:var(--border);height:1px;margin:4px 0}:root{--safe-bottom:env(safe-area-inset-bottom,0px)}.withFixedCta{padding-bottom:calc(92px + var(--safe-bottom))}.mobileFixedBar{display:none}@media (max-width:640px){.mobileFixedBar{padding:12px 14px calc(12px + var(--safe-bottom));-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);z-index:60;background:#ffffffeb;border-top:1px solid 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